weld-probe failed to display application context - json error

I enabled the development mode, when open up the weld probe page,

http://localhost:8080/horizon/weld-probe#/context/application

it popup a dialog shows the message: "Unable to get JSON data: parsererror"
Also in the JS console: it shows: "Error while processing route: context".

I have several application scoped beans and also I'm using old flat jar deployment.